Notice I didn't say "left the band". It depends on whose side of the story you hear as to whether he left for of his own accord, or he was pushed. A rather contentious podcast recently suggested Brian was forcefully ejected after disclosing his serious hearing loss, however the official press release from the band suggests he left.
We'll probably never know for certain. Suffice to say that the band have now been through their 3rd singer in their 40 year career and they are now looking for another one.
The question that I need to ask is why wasn't hearing protection ever considered at some stage in the past? It's not that big a deal, really. It shouldn't have come to this. Iggy Pop may reckon hearing protection is for chumps, but if you're onstage every night for 40 years dealing with volume at that level, seems fair to use it, doesn't it?
Now I hear Angus on the lookout for a new replacement singer to complete the last 10 dates on the Rock or Bust tour. Initial signs are not promising but more on that later...